The Shared Lane Use marking indicates to all vehicle operators that the lane is only wide enough to accommodate one vehicle at a time and cyclists may need to "claim the lane." Whether or not there is a marked bicycle lane, cyclists should not operate so close to parked cars that opening doors may hit them. While parked drivers who fail to obey RSA 265:96 by opeing a vehicle door into a cyclist's path may receive a small fine, cyclists should consider that passengers, too, could open car doors without warning. The results of a "dooring" crash will be catastrophic. Watch the WMUR backstory of a dooring crash in Durham.

"I AM TRAFFIC" hosts an interactive graphic that helps motorists and cyclists judge when a traffic lane can not simultaneously accommodate a motor vehicle and a bicycle.